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Old 03-31-2020, 08:48 PM   #21 (permalink)
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A computer controlled automatic transmission should actually learn how you drive and adjust to protect itself. If you drive nice and easy your transmission will shift soft and early. If you drive it like a fire truck going to a fire the transmission will shift hard and late. The computer raises the line pressure to protect itself, this makes for quick and very stiff shifts. When you clear trouble codes most newer cars reset the learn function and you have to start over training your car how you drive.

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Old 04-01-2020, 01:54 PM   #22 (permalink)
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So, if I bought a used 06 BMW 325i with the auto trans and it has never had DTCs cleared, I might expect that it is still working on old driving assumptions? Even after 13 months? Could that help explain slightly hard shifting out of first and second gear?
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Old 04-01-2020, 02:34 PM   #23 (permalink)
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Because sporty.

It's a feature.
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Transmission type Efficiency
Manual neutral engine off.100% @MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%

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Old 04-01-2020, 04:08 PM   #24 (permalink)
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I would expect even a BMW to adapt to your driving style in 10 drive cycles or so. They start off with factory defaults only if the codes are cleared. You should never have soft long shifts in anything sporty.
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Old 04-20-2020, 09:39 AM   #25 (permalink)
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288,000 miles on my Cobalt, suspension almost all original. I have never replaced struts on any cars but this is the most miles I've ever put on one and think I can get 2 more years out of it (60,000 miles or so). Rust is starting and have had to replace some fuel line already.

Is it worth replacing struts?

Do they really have any effect on tire life if not leaking oil? (One's been clunking on bumps for 5+ years, I think it the top mount).

It ate the current set of front in 18,000 miles I couldn't find anything loose yesterday and had the car aligned once it it's life a 2 years or so ago. Going to try to get the get alignment checked tomorrow and see if he can see something loose that I didn't.
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Old 04-20-2020, 10:04 AM   #26 (permalink)
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I am sure that new struts will make your car better. The cost of the struts will help save on future tire wear. Delta chassis GM cars do wear front suspension parts. Some struts wear out in 60,000 miles on them when driven on rough roads. Discuss this with your alignment person. Loaded struts come complete and solves the problem with rusty springs also.
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Old 04-20-2020, 10:49 AM   #27 (permalink)
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I recently had someone tell me there was no way my struts were still good at 260k miles, he was under the impression they should all be replaced at 60k. We did a bounce test and the dampening still seems fine. I can't say I've ever owned a vehicle without a zillion miles, so I'm not the best judge. If it seems fine, it's fine?
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Old 04-20-2020, 11:51 AM   #28 (permalink)
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Quote:
Originally Posted by roosterk0031 View Post
288,000 miles on my Cobalt, suspension almost all original. I have never replaced struts on any cars but this is the most miles I've ever put on one and think I can get 2 more years out of it (60,000 miles or so). Rust is starting and have had to replace some fuel line already.

Is it worth replacing struts?

Do they really have any effect on tire life if not leaking oil? (One's been clunking on bumps for 5+ years, I think it the top mount).

It ate the current set of front in 18,000 miles I couldn't find anything loose yesterday and had the car aligned once it it's life a 2 years or so ago. Going to try to get the get alignment checked tomorrow and see if he can see something loose that I didn't.
if one is broken and you know it's broken you can be liable if that causes an accident i.e wheel falls off hits another car., or you lose control and causes an accident
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Old 04-20-2020, 09:32 PM   #29 (permalink)
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You said you had a clunk, something is wrong and it may be from rust. Your needs to have a professional alignment person give it a once over. You can then decide what you need to do.
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Old 04-21-2020, 02:04 PM   #30 (permalink)
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I am a life long professional mechanic and am offering advice on auto and truck repair issues. I have been a moderator on a Saturn specific site for a couple years but the site does not like my vpn. So I am offering my services here. I will try to provide correct information to all.
Andy

I don't have a mechanical problem to sort out at the moment... I just wanted to say THANKS for being so generous with your time & expertise.

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